Word〜階かい〜kaiMeaningfloor counterPart of speechsuffixPronunciationCourseJapaneseLessonThe floor counter 階Breakdown of 〜kaistory of a building階A wall surrounds all stories of a building. That's why the roof isn't considered a story.Usages of 〜kai一いっ階かいikkaifirst floor; ground floor二に階かいnikaisecond floor